Valve



L. L E B L. P.. A. u d o M o m VALVE.

No.`472.914. Patented Apr. 12, 1892.

NWN.

` NITnD STATES ATENT OFFICE.

VALVE.

SPECIFICATION forming part of Letters Patent No. 472,914, dated April12, 1892.

Application ned April 15, 1890.

city and county of San Francisco, State of California, have invented anImprovement in Valves; and I hereby declare the following to be a full,clear, and exact description'of the Same.

My invention relates to that class of valves usually termed gates, usedfor water, steam, dac., and in which opposing disks are forced outwardlyto and are withdrawn from their seats by means of a plunger operatingagainst or upon their inner sides.

My invention consists in the novel arrangement of the valves in theshell and the novel construction and connection of the plungertherewith, hereinafter fully described, and specifically pointed out inthe claims.

The object of my invention is to provide for a suiicient amount offreedom in the connec-l tion of the valve-disks with the operatingplunger to permit said disks in returning to their seats to presentdifferent points of bearing or contact at each operation, whereby theyare not liable to uneven wear.

Referring tothe accompanying drawings for a more complete explanation ofmy invention, Figure l is a section of my valve, one of the disks B andthat side of the plnngerB which engages said disk being shown inelevation. Fig. .2 is an elevation looking into the passage a of theshell and showing the outer face of disk B.

The shell A is preferably made in two pieces bolted together and havinga straight-way passage a the full diameter of the pipe. In thispassage-one on each sid e-are located the valve-disks B, whollyseparated from one another. Each is faced with suitable rings bsay ofhard gun-metal-which, when the disks are closed, bear againstcorresponding guninetal rings a in the disk-seats. These seats arestraight, as shown, and the disks are forced up to them straight. Theback or inner side of each disk is formed with a central cone h', thebase of which extends deep enough into the disk to leave an encirclinglip b2.

The spindle C, though it may be of any character, is here shown as ofthe stationary type, having a thread cut on it within the Serial No.348,056. (No model.)

-shell and carrying at its lower end a plunger D, here shown as a loosenut, and which lies Abetween the opposing disks B. The lower vend ofthis plunger is widened out to form a shoulder at d, and the faces ofthis, widened ed in the shell and rest upon its interior walls.

They are not carried by the plunger, but are supported or guided by thecasing or shell of the valve. The effect of thus mounting and supportingthe valve-disks and the loose oonnection between them and the plunger isto cause the movement of the disks to and from their seats by reasonofthe movement of the plunger and to allow said disks a rolling actionupon the shell-walls during this movement. When' the plunger 'iswithdrawn, it relieves the disks .of its wedging action and at the sametime by the engagement of its shoulder d with the lip b2 of said disksit withdraws the latter from their seats. In this withdrawal the disksbearing on the walls of the shell roll or turn axially. When the plungeris again projected, it forces the disks back to the plane of theirseats, and .then said disks, coming in contact with the end of the shelland being able to move no farther, receive the wedging action of theplunger against their conical projections, whereby they are forcedoutwardly to their seats, the wedging action taking place after thedisks have come to a state of rest. This rolling action of the disks,due to their contactwith the interior walls of the shell and beingunhindered in any manner by their connection with the plunger, is not ofan equal or certain character, as would be the case if the rollingaction were due to the engagement of the disk with positive gears, suchas a rack or the threads of a screw; but said roll- -ing action, beingthe result of mere contact with the walls of the shell, results in annnequal and uncertain rotary motion, which is This forms a i IOO notlikely to return the disks to exactly the same points of contact orbearing against their seats at each operation. In other words, theyclose in a different position at each operation of the valve, thusinsuring them from excessive wear at any one point. When be ing drawnback, the disks are steadied as they rise or move into a shell and leavetheir seats by guide-pieces a2 in the shell corners, which come outabout even with the seat planes and receive the edges of the disks, sothat they cannot tip outwardly.

Anothergreat advantage of this gate is that the disks are rolled looselyinto their closed position before the wedging action takes place,thereby closing them without the usual grinding action of the disksagainst their seats, whereby cutting of the seats is caused andconsequent leaks. I his advantage is due not only to the peculiarconnection between the plunger and the disks, but also to the straightseats, against which the disks are forced, which said seats are renderedpossible by the plunger connection, as the disks do not grind againstthe seats in coming to position and are not forced upon them until theyare fully in position, and then they are forced out squarely.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. Ina valve or gate having a shell with opposing seats, thecombination, with the valve, of disks mounted within said shell andresting and adapted to roll directly on itsinner Walls and limited bythe outer end of the shell to al position opposite their seats, saiddisks havingconical centers on their adjacentfaces, with lips encirclingthe bases of the cones, and a reciprocating plunger having a shoulder onits lower end bearing under the llip of the disks to operate them,substantially as herein described.

2. In a valve or gate having the shell with vopposing seats, thecombination, with the inner walls, whereby they are caused to roll intheir movement and limited by the outer end of the shellin a positionopposite their seats, said disks having on their inner surfaces thecone-centers with encircling lips at the bases of said centers, and thereciprocating plunger having a shoulder at its lower end bearing underthe lip of the disks, and conically-con-- caved faces fitting only theinner'portion of the cone-centers of the disk, substantially as hereindescribed.

4. In a valve or gate, the shell having the opposing seats and theguides a2 above said seats, in combination with the rolling disksmounted within the shell and bearing on its inner walls and limited byits outer end when closing and supported by the guides d2 when opening,said disks having the cone-centers on their inner surfaces, Withencircling lips at their bases, and the reciprocating plunger having ashoulder atits lower end bearing under the lip of the disks, andconically-concave faces fitting only the inner portions of thecone-centers of the disks, substantially as herein described. l

In Witness whereof I have hereunto set my hand.

' ARTHUR F. L. BELL.

Vitnesses: A

S. I-I. NoURsE, H. C. LEE.

